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Monolithic Power Systems Inc. MP2661GC-XXXX-P
- Part No.:
- MP2661GC-XXXX-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Battery Chargers
- Package:
- 9-WFBGA, WLCSP
- Datasheet:
-
MP2661GC-XXXX-P.pdf
- Description:
- 500MA, I2C-CONTROLLED BATTERY CH
- Quantity:
- Payment:
- Shipping:
Inventory:1,446
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Product details
Overview
MP2661GC-XXXX-P from Monolithic Power Systems is a fully integrated, I²C-controlled single-cell Li-ion/Li-polymer battery charger with autonomous power path management. It delivers up to 455mA charge current, regulates system output at 4.65V ±0.5%, and features dual FETs (300mΩ IN→SYS LDO, 100mΩ BATT→SYS) for simultaneous system powering and battery charging in space-constrained wearables and smartwatches.
For engineers reviewing the MP2661GC-XXXX-P datasheet, MP2661GC-XXXX-P pinout, MP2661GC-XXXX-P application, or MP2661GC-XXXX-P equivalent, key selection criteria include I²C-programmable input current limit (65–455mA), configurable battery UVLO (2.4–3.1V), thermal regulation at 120°C, and WLCSP-9 package compatibility with high-density PCB layouts.
Technical Context
The MP2661 implements a direct power path architecture with independent control loops for input-to-system (LDO-based) and battery-to-system (FET-based) power delivery. Its I²C interface configures all critical parameters-including fast-charge current (8–535mA), pre-charge threshold (2.8–3.1V), and recharge hysteresis (120–350mV)-enabling precise adaptation to battery chemistry and system load profiles.
Charge sequencing follows three validated phases: pre-charge (configurable 6–27mA), constant-current fast charge (programmable up to 455mA), and constant-voltage regulation (3.6–4.545V with ±0.5% accuracy). Thermal limiting (120°C junction regulation) and NTC-based temperature monitoring operate concurrently with DPM logic that dynamically reduces charge current when input voltage drops below VIN_MIN (3.88–5.08V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Up to 455mA programmable via I²C; enables full charge of 500mAh batteries in under 2 hours with thermal-aware current tapering. |
| System Output Voltage | 4.65V ±0.5% regulated; maintains stable MCU/peripheral rail even during battery charging or supplement mode transitions. |
| Input Voltage Range | 4.35V to 5.5V (USB-compliant); supports standard USB ports while rejecting noise and transients via 5.85–6.15V OVP. |
| Battery Regulation Range | 3.6V to 4.545V; covers standard Li-ion (4.2V) and high-voltage Li-polymer (4.35V) chemistries with register-level precision. |
| Power Path FETs | 300mΩ IN→SYS LDO + 100mΩ BATT→SYS switch; decouples charging from system load, enabling true zero-battery-startup and safe charge termination. |
| Thermal Regulation | 120°C junction limit (REG06h bits[1:0]=11); actively throttles charge current before reaching 150°C shutdown, preserving battery health. |
| I²C Interface | Standard-mode (400kHz) with SDA/SCL pins; allows real-time readback of status registers and dynamic reconfiguration without reset. |
Pinout & Package
MP2661GC-XXXX-P is housed in a WLCSP-9 package (1.55mm × 1.55mm, 0.4mm pitch), optimized for ultra-thin portable designs. The die-scale package requires microvia routing and controlled impedance layout for NTC and I²C signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 IN | Power Input | Accepts 4.35–5.5V USB/adapter input; connects to 10µF ceramic capacitor for transient suppression and DPM stability. |
| A2 SYS | System Power Output | Delivers regulated 4.65V to host system; requires local 10µF ceramic bypass to maintain PSRR during load steps. |
| A3 BATT | Battery Connection | Direct connection to single-cell Li-ion anode; integrates 100mΩ discharge FET for ideal diode behavior during supplement mode. |
| B1 NTC | Analog Temperature Sense | Interfaces with external NTC thermistor; enables hot/cold window detection (63–67% VDD cold, 31–35% VDD hot) to suspend charging outside safe range. |
| B2 INT | Interrupt/Control | Open-drain status indicator (fault/complete) and hardware battery disconnect trigger (16s low pulse disables BATT→SYS path). |
| B3 VDD | Internal Bias Supply | Internal LDO output; powers control logic and must be decoupled with 0.1µF ceramic-no external loading permitted. |
| C1 SDA | I²C Data | Bi-directional data line; requires 10kΩ pull-up to host logic rail (1.8V/3.3V) for reliable register access and status polling. |
| C2 SCL | I²C Clock | Master-driven clock input; same 10kΩ pull-up as SDA; timing compliant with 400kHz Fast Mode for rapid configuration. |
| C3 GND | Ground Reference | Primary return path for all power domains; must connect to solid ground plane with minimal trace inductance to avoid NTC/INT noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous Power Path Management | Separates system load from battery charging current using dual FETs-ensures continuous SYS rail operation even with deeply discharged or missing battery. |
| I²C-Configurable Safety Timer | Programmable watchdog (160s max) prevents indefinite charging; terminates cycle if CV phase exceeds time limit, reducing thermal stress on cell. |
| PCB Over-Temperature Protection (PCB_OTP) | Dedicated NTC monitoring channel triggers battery disconnect at 30–34% VDD (≈45°C PCB temp), preventing board-level thermal runaway. |
| Dynamic Power Management (DPM) | Monitors VIN and IIN in real time; reduces charge current before VSYS droops below 4.56V, avoiding brownout of connected peripherals. |
| Battery Disconnect Function | Hardware-controlled BATT→SYS FET disable via INT pin; isolates battery during storage or fault conditions to prevent over-discharge below 2.6V UVLO. |
Applications
| Wearable Health Monitor | Smartwatch Power System |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing with Bluetooth LE transmission every 5 seconds, requiring stable 3.3V rail and <10µA sleep current. IC Role / Device Role / Timing Role: Single-cell charger with power path ensures uninterrupted sensor operation during USB charging; I²C enables runtime adjustment of charge current to match battery aging. Use Value: 4.65V SYS regulation eliminates need for external LDO; 32µA battery quiescent current extends shelf life beyond 6 months. |
Use Scenario: Always-on display with ambient light sensing and haptic feedback, drawing 15mA average but spiking to 300mA during UI updates. IC Role / Device Role / Timing Role: Dual-path power manager supplies system from USB or battery seamlessly; supplement mode engages within 30mV VBATT–VSYS delta to prevent display flicker. Use Value: 100mΩ BATT→SYS FET enables >95% discharge efficiency; thermal regulation prevents touch-screen latency during summer outdoor use. |
| Fitness Tracker Charging | Wireless Earbud Case |
|
Use Scenario: Compact wristband with 120mAh battery, charged via micro-USB; must survive 500+ charge cycles with minimal capacity loss. IC Role / Device Role / Timing Role: Precision CV regulator (±0.5%) and programmable UVLO (2.8V) prevent lithium plating and over-discharge, extending cycle life. Use Value: Pre-charge current configurable down to 6mA safely revives cells below 2.8V; auto-recharge at 160mV below VBATT_REG maintains optimal SOC. |
Use Scenario: Dual-chamber earbud case with 300mAh battery, charging both earbuds simultaneously while maintaining case Bluetooth connectivity. IC Role / Device Role / Timing Role: I²C-controlled input current limit (455mA) matches USB 2.0 spec; power path prioritizes case system load over earbud charging to sustain BLE link. Use Value: 13V absolute max input rating tolerates accidental 12V adapter misconnection; short-circuit protection safeguards earbud battery terminals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-cell Li-ion charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24250RGET | Fixed 4.2V CV, no I²C; 500mA max charge current; no power path management-requires external ideal diode for supplement mode. | Lacks autonomous power path; cannot maintain SYS rail during battery charging without additional components. | Select only if cost sensitivity outweighs design simplicity and size constraints. |
| MAX17599ATJ+ | 4.35V CV option only; 1.2A charge current; analog-programmed (resistor-based) rather than I²C-configurable. | No digital interface limits runtime adaptation; higher current unnecessary for sub-500mAh cells. | Choose only for high-current legacy designs where I²C bus is unavailable. |
Compared with BQ24250RGET and MAX17599ATJ+, MP2661GC-XXXX-P uniquely combines I²C configurability, integrated power path, and WLCSP-9 footprint-reducing BOM count by 3 passive components and enabling firmware-tuned charge profiles for battery longevity.
Availability
MP2661GC-XXXX-P is available at Aetrix Electronics and suitable for wearable health monitors, smartwatches, and wireless earbud cases requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2661GC-XXXX-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-efficiency analog and power ICs, with over 20 years of expertise in battery management and DC/DC conversion.
The MP2661 belongs to MPS's ultra-compact battery charger product line, designed specifically for space-constrained portable electronics where autonomous power path control and I²C configurability are mandatory.
FAQ
What is the minimum input voltage required for MP2661GC-XXXX-P to initiate charging?
The device enters operational mode when input voltage exceeds 3.9V (rising VIN_UVLO threshold), but stable charging begins only after VIN reaches 4.35V-the lower bound of recommended operating range. Below 4.35V, the IC remains in low-quiescent standby (480µA) and disables charge FETs to prevent unstable regulation.
How does the MP2661 handle battery over-discharge protection?
It enforces configurable battery UVLO (2.4–3.1V) via REG01h bits[2:0]; when VBATT falls below the selected threshold, the BATT→SYS FET turns off within 1ms. Hysteresis of 210mV prevents chatter, and the battery remains isolated until VIN rises above VIN_UVLO and I²C re-enables charging.
Can the MP2661GC-XXXX-P operate without an NTC thermistor?
Yes-NTC is optional. If unconnected, the NTC comparator defaults to "in-range" state and charging proceeds normally. However, thermal safety certification (IEC 62368-1) requires NTC implementation for production designs; the IC will not assert thermal faults without it.
What happens during USB disconnection while the system is powered?
Within 30mV of VBATT–VSYS delta, the battery FET activates in ideal diode mode, maintaining VSYS at VBATT − 22.5mV. If system load exceeds battery capability, VSYS drops gradually-no hard reset occurs, and the 4.65V regulation resumes instantly upon USB reconnection.
Is the 455mA charge current sustainable at 125°C junction temperature?
No-thermal regulation at 120°C (REG06h=11) actively reduces charge current before reaching 125°C. At 120°C, ICHG is throttled to ~200mA; full 455mA is only achievable below 85°C ambient with adequate PCB copper pour and airflow.
Does the MP2661GC-XXXX-P support USB PD input negotiation?
No-it accepts fixed 5V input only. For USB PD compatibility, an upstream buck-boost controller (e.g., MPQ4272) must negotiate voltage and feed 5V to the MP2661's IN pin; the IC itself lacks PD PHY or communication logic.
How is the "xxxx" in MP2661GC-XXXX-P configured for production?
The "xxxx" suffix reflects factory-programmed I²C register defaults (e.g., 0000 = 4.2V CV, 455mA IIN_LIM). Custom configurations require MPS FAE support to generate unique top-marking codes; field reprogramming is possible via I²C but does not alter the physical part number marking.
MP2661GC-XXXX-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 9-WFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature, Short Circuit
- Charge Current - Max:
- 455mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- I2C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-WLCSP (1.55x1.55)
MP2661GC-XXXX-P FAQ
1.How can I place an order for MP2661GC-XXXX-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2661GC-XXXX-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP2661GC-XXXX-P reliable?
The price and inventory of MP2661GC-XXXX-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2661GC-XXXX-P is usually 5 days.
3.What payment methods are accepted for MP2661GC-XXXX-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2661GC-XXXX-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2661GC-XXXX-P?
MP2661GC-XXXX-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2661GC-XXXX-P order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP2661GC-XXXX-P?
For technical support, including MP2661GC-XXXX-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2661GC-XXXX-P requirements.
6.How does Aetrix verify that MP2661GC-XXXX-P is sourced from the original manufacturer or authorized distributors?
All MP2661GC-XXXX-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP2661GC-XXXX-P meets industry standards.
7.What is the process for return or replacement of MP2661GC-XXXX-P?
All MP2661GC-XXXX-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2661GC-XXXX-P, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP2661GC-XXXX-P part is unused and in its original packaging.
Return procedure for MP2661GC-XXXX-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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